@article{sundin_wulff_2012, 
  title={Classical integrability and quantum aspects of the AdS 3 × S 3 × S 3 × S 1 superstring}, 
  volume={2012}, 
  DOI={10.1007/jhep10(2012)109}, 
  number={10}, 
  publisher={Springer Nature}, 
  author={Sundin and Wulff}, 
  year={2012}
  }